英文とのリンクを削除しました。
[#4586785] This is still a difficult question for science to answer.
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This sentence was initially added as a translation of sentence #2082810
added by Kiraness, September 27, 2015
linked by Kiraness, September 27, 2015
linked by Rime, October 7, 2015
unlinked by KK_kaku_, May 9, 2023